@picofarad As far as I can tell, such compiler was useless, as it was proprietary software (that could not have been freely distributed or modified) and it appears that it doesn't really implement C good enough for a good kernel.

It was only relicensed in 2002; https://raw.githubusercontent.com/mortdeus/legacy-cc/refs/heads/master/Caldera-license.pdf


To actually compile that compiler, you needed a C compiler already, making such proprietary compiler redundant for C compiler development.

A different proprietary C compiler was used to compile the first few versions of GCC, but such proprietary compiler was then never run again.